Sorption And Kinetics Study Of Potassium Chloride In Polyvinyl Alcohol-Borate Hydrogel
Rehana Saeed, Zain Ul Abdeen
Index Terms: Adsorption Isotherm, Conductometric studies, Desorption, Hydrogel, Kinetics, PVOH-borate
Abstract: Isotherms for the adsorption of KCl in PVOH-borate hydrogel was studied at 303 K by determining the amount of potassium and chloride ions adsorbed in PVOH-borate hydrogel using ion exchange chromatography and potentiometric titrations respectively. Experimental data was tested for Frendulich’s, Langmuir’s, Temkin’s and Dubinin–Radushkevich isotherms equations. The adsorption data follows isotherms in order Frendulich’s > Dubinin–Radushkevich > Temkin’s. Kinetics of adsorption and desorption processes were studied using conductivity method. The applicability of pseudo first order, second order kinetics and intra particle diffusion kinetics were tested. From standard deviation, R2 and 2 values it can be concluded that sorption of KCl using PVOH-borate hydrogel as an adsorbent obey pseudo first order kinetics. Intra particle diffusion rate constant increases on enhancement in the contents of KCl. Obeying Temkin’s isotherm and intra particle diffusion kinetics confirmed the presence of interaction between potassium ions and PVOH-borate hydrogel during sorption phenomenon.
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